Jared Fogle's Wife -- Divorce Docs Indicate ... She Had No Clue Until Yesterday

It appears Jared Fogle's wife was blindsided by the severity of the charges against her husband, because she sent him packing at the same time prosecutors charged him with having sex with minors.

Katie Fogle filed divorce papers Wednesday and according to docs, obtained by TMZ, she lists the date of separation as the same day.

Prosecutors held their cards close to the vest until they filed formal charges yesterday, detailing Jared's sexual liaisons with underage girls. Until yesterday, it appeared the only charges involved possessing child porn.

Katie expressed shock when she announced yesterday she was going to divorce Jared. Bottom line ... it seems the underage sex charges were an enormous, hideous surprise.

As for the divorce ... she says she'll offer a specific custody proposal when the judge hears the case, but wants to make it clear the order should be in the best interests of the couple's 2 kids.

She says she wants the financial assets divided in a "just and reasonable" manner.